your kickstart file (I am guessing) was generated by mkkickstart ... or at least
something similar was used to generate your package list, as you have packages
in that list that are not available in Red Hat Linux 7 ...
for example, ispell (as in your error above) is no longer available, similarly
packages like libgr, libgr-devel, egce-c++, etcskel, etc. are not valid install
package candidates ...
Have you considered using package groupings ...?
You can specify predefined groups of packages such as:
%packages
@Base
@X Window System
@GNOME Workstation
to install useful sets of packages ...
hope this helps ... thanks for your report!

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